JPH0655071B2 - Breathable sheet repair tape - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation tape, for example, a repair tape for ventilation sheets for agriculture, forestry and civil engineering.

[0002]

2. Description of the Related Art Conventionally, windproof nets and curing nets have been known as ventilation sheets for agricultural, forestry and civil engineering,
For example, as a breathable sheet that can be heat-sewn, Japanese Patent Application Laid-Open No.
No. 8-57934, JP-A-58-179640, and JP-A-58-180666.
These ventilation sheets are known to have advantages such as good ventilation, easy handling, and few accidents due to wind pressure. However, since these ventilation sheets are coarse, it is difficult to repair them when tearing occurs, and it has been strongly desired to provide a preferable repair material.

As such a repair material, a method may be considered in which the same sheet as the ventilation sheet is used and this is adhered to the portion of the ventilation sheet requiring repair by using an adhesive. It is difficult to apply the adhesive to the repair sheet, the adhesive strength between the repair material and the ventilation sheet is insufficient, and the repair material is deformed or the yarn slips during the repair operation. There are problems such as being easy.

[0004]

SUMMARY OF THE INVENTION According to the present invention, when repairing a rough ventilation sheet, it is easy to apply an adhesive, and deformation and yarn slippage do not occur, and sufficient adhesion is achieved. The purpose of the present invention is to provide a repair tape that can obtain high strength.

[0005]

The above problems can be solved by the repair tape of the present invention. That is, the repair tape for a ventilation sheet according to the present invention comprises at least a coarse-grained woven fabric-based base cloth composed of yarns including warp yarns and weft yarns arranged in parallel with each other with a gap between the yarns. A substrate, and a flexible polymer film layer adhered to at least one surface of the rough substrate, wherein the polymer forming the film is regenerated cellulose, cellulose esters, polyvinyl chloride, polyester, Polyamide, polyurethane, polypropylene, polyethylene, ethylene-
It is characterized by being selected from a vinyl acetate copolymer, an acrylic resin, and polyvinylidene chloride.

[0006]

The yarn constituting the coarse woven base fabric is covered with a layer of a thermoplastic polymer having a melting point of at least 5 ° C. lower than the melting point or the thermal decomposition temperature of the yarn, and they are mutually It is preferable that the yarn is a composite yarn which is bound to each other by the polymer coating layer at the intersection.

Further, it is preferable that the yarns inside the coarse substrate have a flat cross-sectional shape parallel to the plane of the coarse substrate. Such a flat cross-sectional shape of the yarn enhances the adhesiveness of the rough substrate to the flexible polymer film, and also as a repair tape, increases the effective bonding area to enable strong repair bonding. .

The repair tape of the present invention has a rough base layer 2 composed of a large number of yarns, as illustrated in FIG.
1 and at least one side thereof, for example, a flexible polymer film layer 22 adhered on one side as shown. A large number of through holes 23 may be formed in the film layer 22. The through holes can communicate with the voids of the rough substrate to realize the ventilation of the repair tape.

Although there are no particular limitations on the yarns that make up the coarse woven base fabric used in the repair tape of the present invention,
Cellulose fibers that do not exhibit a melting point, such as cotton,
Hemp, rayon, and cupra, high-melting inorganic fibers such as glass fibers and metal fibers, relatively high-melting synthetic fibers such as polyester fibers and polyamide fibers, or synthetic fibers that do not exhibit a melting point such as vinylon. (Water-insolubilized polyvinyl alcohol) Fibers or the like, or those composed of a mixture of two or more thereof are used. The shape of the yarn is not particularly limited, and may be spun yarn, monofilament yarn, multifilament yarn, split yarn, tape yarn, or the like.

Among these yarns, the warp yarns and the weft yarns constituting the base fabric useful in the present invention are 100 to 500.
Particularly preferred are 0 denier polyethylene terephthalate, multifilament yarn (melting point = about 260 ° C.) and vinylon multifilament yarn (pyrolysis at about 220 to 230 ° C.) because they have excellent strength.

In the present invention, there is no particular limitation on the structure of the coarse woven base fabric used for the coarse substrate, but for example, a plain weave composed of warp 1 and weft 2 as shown in FIG. 2A, Weft 3 as shown in 2B
The two warp yarns 4a and 4b are connected while being entwined, or a warp weave, or, as shown in FIG. 3, a warp yarn 6 parallel to each other on a layer of weft yarns 5 parallel to each other.
Preferably, a leno weave or the like in which the warp yarns and the weft yarns are superposed so that the warp yarn direction and the weft yarn direction are orthogonal to each other and the warp yarns 6 and the weft yarns 5 are connected by the leno yarns 7.

In the rough substrate used in the present invention,
The warp and the weft of the yarn are adjacent to each other in parallel.
A gap of about 0.5 to about 15 mm is formed with the strip.
It is preferable that the gap between the yarns is 1.0 to 10 mm.
More preferably. That is, between warp and weft
The area of the interstitial space formed at about 0.25-225mm ²
Is preferably 1 to 100 mm²To be
Is preferred.

Generally, the coarse woven base fabric used in the present invention preferably has a basis weight of 40 to 500 g / m ² .

The base fabric constituting the rough substrate may or may not be coated with a thermoplastic polymer.

The yarn constituting the coarse substrate used in the present invention has a melting point of at least 5 ° C., preferably 10 to 20 ° C., lower than the melting point or the thermal decomposition temperature of the yarn of the coarse woven fabric. It is preferred that the yarns are composite yarns which are covered by the coalesced coating layer and which are wrapped and mutually bonded by the polymer coating layer at their intersections. When the difference between the melting point of the polymer coating layer and the melting point or thermal decomposition temperature of the yarn is less than 5 ° C, shrinkage, melting, deterioration, etc. of the yarn may occur during the heating and pressing process, high frequency or heat stitching. I have something to do.

The polymer for the coating layer is generally 100
A thermoplastic polymer having a melting point of ˜250 ° C. such as polyvinyl chloride, polyurethane or ethylene-vinyl acetate copolymer is used.

The yarn has a flat cross-sectional shape parallel to the plane of the coarse substrate. This flat cross-sectional shape can be obtained, for example, by subjecting a coarse substrate made of a yarn coated with a polymer coating layer to a hot press, and the yarn is
It is desirable that it is not deteriorated by this high temperature heating press.

The weight of the polymer coating layer is not particularly limited as long as it is sufficient for heat stitching or high frequency stitching, but generally it is preferably 20% or more based on the weight of the base cloth.
It is more preferably 70 to 200%. When the repair tape of the present invention contains a foamed polymer coating layer and is not subjected to heating or high frequency suture, the weight of the polymer coating layer is about 20 to 30% based on the weight of the base cloth. It may be.

To form the polymer coating layer as described above, the base cloth is dipped in a solution or emulsion containing the polymer, squeezed to a desired degree, dried, and optionally heat treated. do it. In order to impregnate the base solution with the polymer solution or emulsion, a spray method, a coating method, a brushing method, or the like may be used in addition to the above. In addition to the polymer, the polymer solution or emulsion contains a flame retardant (for example, antimony trioxide),
It may contain a color pigment, an antioxidant, an ultraviolet absorber, a foaming agent, and other additives.

In the repair tape of the present invention, as shown in FIGS. 4 and 5, the composite yarns 1A and 2A intersecting each other have a polymer coating layer 1a,
In addition, it has a flattened cross-sectional shape in a direction parallel to the plane of the rough substrate. In order to flatten the polymer layer-coated composite yarn in this way, it can be obtained only by forming the polymer coating layer on the yarn by the above-mentioned step, but thereafter, pressing the obtained polymer-coated coarse substrate. It is even better if a pressing process such as embossing or calendaring is performed.

The pressing treatment can be carried out using a flat press or a press (calender) roll. The rough substrate may be heated together with the pressing process. For such heating, the heating device may be arranged in front of the press or the press roll, or the heating device may be incorporated in the press plate or the press roll. At this time, the heating temperature and the press pressure differ depending on the polymer used for coating, the type of the substance constituting the yarn, the desired degree of flattening, etc.
It is preferable that the temperature is ˜150 ° C., preferably 50 to 130 ° C. and the range is 0.1 to 50 kg / cm, preferably 1.0 to 20 kg / cm. Of course, cold pressing without heating is also often used.

The polymer coating layer formed on the repair tape of the present invention may be a porous layer made of a foamed polymer. In that case, the air bubbles may be in communication with each other, may be independent, or may be a mixture of both. Such a porous polymer coating layer not only reduces the weight of the repair tape, enhances the flexibility and flexibility and gives a heavy feeling, but also facilitates the flattening of the yarn by the pressing process. Therefore, when the yarn is coated with the same weight of polymer, the apparent thickness of the coated yarn becomes significantly large.

The yarn having a flat cross section may be formed by aligning two or more yarns, and may further be formed with a polymer coating layer.

The degree of flattening of the yarn can be arbitrarily set as desired. In FIG. 6, in the flat cross-sectional shape of the composite yarn 2A, the ratio of the length (l ₁ ) in the direction parallel to the rough base plane and the length (l ₂ ) in the direction perpendicular to the coarse base plane is 1 It is preferably within the range of 3: 1 to 7: 1, and within this range, l ₁ : l ₂ ≧
It is more preferably 2: 1 or more.

As described above, when the yarn has a flat cross-sectional shape, the repair tape of the present invention has appropriate flexibility and bendability, increased coverage, and reduced bulkiness. In addition, when it is provided with a polymer coating, the adhesive strength at the intersections of the yarns is high, and therefore it is easy to handle, and there is no slip between the yarns, and it has practically sufficient strength and durability. have.

As described above, in order to obtain a polymer layer-coated composite yarn having a flat cross-sectional shape, it is desirable that the yarn of the base fabric easily deforms its cross-sectional shape to be flattened. . Therefore, a so-called sweet twisted yarn having a relatively small number of twists is preferable as the yarn, but it is not necessarily limited to this. Untwisted filament yarn can be used, but it is not preferable because it is not easy to handle and weaving is difficult.

In any case, it is preferable to deform and fix the thermoplastic polymer coating the yarns in the base cloth, thereby flattening the composite yarns and fixing them in this shape.

When the polymer-coated or uncoated rough substrate is subjected to a pressing treatment, the pressing surface or the calender roll peripheral surface may be smooth, or it may have the desired regular or irregular surface. It may have fine irregularities. In the case of the former, the surface of the polymer coating layer of each composite yarn of the obtained rough substrate is smooth, and in the case of the latter, fine irregularities of desired shape and pattern are formed on the surface of the polymer coating layer of each composite yarn. To be done.

Only one surface of the rough substrate may be smooth and fine irregularities may be formed on the other surface, or the shapes and patterns of the fine irregularities formed on both surfaces may be different from each other. By imparting the fine irregularities to the yarn, not only the appearance and luster are appropriately adjusted, but also the repair tape obtained from such a rough substrate is easily bent, and the flexibility of the repair sheet is improved. And the handling property can be promoted. The provision of fine unevenness for the purpose as described above is completely new in the field of a ventilation sheet repair tape, and a rough substrate,
It also has the effect of improving the adhesiveness of the repair tape obtained therefrom.

In the repair tape of the present invention, a film made of a specific flexible polymer is attached and integrated on at least one surface of the above-mentioned rough substrate. This film may be adhered to the rough substrate by a usual method such as a fusion method or a method using an adhesive, but when the yarn of the rough substrate has a polymer coating layer,
The film may be adhered to the rough substrate by this polymer coating layer.

The flexible polymer film used in the present invention has good adhesiveness, and regenerated cellulose such as cellophane or a film made of cellulose ester such as cellulose acetate is used. However, the film is preferably excellent in water resistance and weather resistance, and examples of such a film include:
Polyvinyl chloride, polyester (polyethylene terephthalate), polyamide (nylon 6, nylon 66, nylon 11, nylon 12), polyurethane, polypropylene, polyethylene, polyvinylidene chloride, polystyrene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer Films such as polymers, acrylic resins, and ionomer resins, vinylon films, and Poval films.

The film used in the present invention is from 0.05 to
It preferably has a thickness of 1 mm and is preferably transparent, but may be colored in any color.
When a transparent film is used, the pattern of the rough substrate can be seen through as it is. In this case, the sense of discomfort in the repaired portion can be reduced.

The film used in the present invention preferably has a large number of through holes and is itself breathable. There is no particular limitation on the size and density of the through holes. However, considering the ventilation effect, repair operation and repair effect, each through hole has an area of 0.25 to 225 mm ² , and the total area of the through holes is 10% of the total area of the film.
It is preferably in the range of ˜90%.

In order to repair a ventilation sheet using the repair tape of the present invention, an adhesive is applied to either one side of the repair tape, and the adhesive is attached to the portion of the ventilation sheet to be repaired. Then fix it.

In the above operation, when the repair tape has a film layer on only one side thereof, it may be an adhesive surface to the ventilation sheet of the rough substrate surface. In this case,
The presence of the film layer allows the repair tape to be uniformly applied and adhered without deformation or slippage of the yarn.

When the film layer side is used as the adhesive surface,
Since the outer surface of the repaired portion is formed of the rough substrate, light reflection by the film surface is small, discomfort in the repaired portion is reduced, and good adhesiveness to the ventilation sheet can be exhibited. At the time of repair, the repair tape may be attached to only one surface of the repair portion of the ventilation sheet, or may be attached to both surfaces thereof.

[0037]

The present invention will be further described with reference to Examples.

Example 1 Polyester multifilament yarn was used as a background to prepare a warp weave having a design as shown in FIG. 2B. The structure is as follows, and the size of the inter-filament gap was 3.5 mm × 3.5 mm on average.

A polymer composition having the following composition: PVC 100 parts by weight DOP (plasticizer) 80 〃 Stabilizer 1 〃 Antimony oxide (flameproofing agent) 30 〃 Pigment (green) 2 〃 Triclen 25 〃 It was dipped in the treatment liquid, squeezed between a pair of rolls, dried at 180 ° C. for gelation, and the polymer was sufficiently adhered to the yarn surface of the coarse base fabric. As a result, a rough substrate was obtained in which 100% by weight of the polymer composition adhered to the yarns of the rough base fabric.

By the above-mentioned drawing treatment, the obtained composite yarn was considerably flattened. In addition to this, while the polymer-coated coarse base body maintained a temperature of 60 ° C. or higher, the upper and lower sides were The rough substrate was pressed with a pressure of 10 kg / cm using a smooth calendar having a pair of cold pressure rolls.
Ratio l ₁ : l in the composite yarn in the resulting rough substrate
₂ was about 4: 1 and had low bulkiness, was highly flexible, and was easy to handle.

A transparent polyvinyl chloride film having a thickness of 0.3 mm was stuck on one surface of the rough substrate. This attachment is
It was carried out by blowing hot air of 170 ° C. onto the affixed surface of the rough substrate and the film to heat them so that they are superposed and pressed. The obtained composite sheet was cut into a width of 30 cm to form a repair tape, which was wound into a roll.

Using this repair tape, a ventilation net made of polyester filament having a length of about 20 cm
Repaired the rift. First, the repair tape is 30 cm
Each of the two pieces of the repair tape was coated with a polyurethane adhesive (trademark: Evan Grip 8174, manufactured by Cenyl Tilney (Japan) Limited) at a coating amount of 50 g / m ^{2 on} each film layer surface. Two pieces of the repair tape were used to sandwich a crevice in the net at the center of each piece, and the pieces were overlapped and pressed and fixed. The appearance of the repaired net did not look very strange, and the shear strength of the bonded part was 80 kg / 25 mm, which was satisfactory in practice.

Example 2 The same operation as in Example 1 was performed. However, the transparent polyvinyl chloride film used had a large number of circular through holes. The through holes each had an area of about 0.5 mm ² , and the total area thereof was 50% based on the total area of the film. The repaired portion thus obtained had a good appearance and ventilation, and the shear strength of the bonded portion was 70 kg / 25 mm, which was also good.

Example 3 The same operation as in Example 2 was performed. However, 2 for the warp
Two 50 denier yarns were used as alignment fibers, the base fabric was not treated with a polymer, and in the repairing operation, an adhesive was applied to the rough base side of the repair tape piece and stuck to the net. The shear strength of the bonded portion was 85 kg / 25 mm, which was satisfactory.

[0045]

EFFECTS OF THE INVENTION The repair tape of the present invention has an appropriate concealing property, has no fray or slip of the constituent yarns, has moderate flexibility and low bulkiness, and is easy to handle. The repair tape of the present invention is used not only for agriculture, forestry, civil engineering, and construction, but also for sports such as pool coverings, tennis court light-shielding sheets, and camping tent interior sheets, for eaves tents, and for preventing paint scattering during painting construction. It is widely used for repairing various ventilation sheets used for shipbuilding.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing a configuration of an example of a repair tape of the present invention.

FIG. 2A is an explanatory view showing the structure of a plain weave used as a base fabric of the repair tape of the present invention. FIG. 3B is an explanatory diagram showing the structure of the warp weave used as the base fabric of the repair tape of the present invention.

FIG. 3 is an explanatory view showing the structure of a leno weave used as a base fabric of the repair tape of the present invention.

FIG. 4 is a cross-sectional explanatory view of a rough substrate in which the yarn of the plain woven base fabric shown in FIG. 2B is coated with a polymer.

5 is a plan view of the rough substrate shown in FIG. 4. FIG.

6 is a line D- of the composite yarn in the coarse substrate shown in FIG.
It is a cross-sectional explanatory view along D.

[Explanation of symbols]

 1, 4a, 4b, 6 ... Warp 2, 3, 5 ... Weft 1a ... Polymer coating layer 1A ... Composite yarn 2A ... Composite yarn 7 ... Entangled yarn 21 ... Coarse substrate layer 22 ... Flexible polymer film layer 23 ... Through hole

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B32B 27/12 E01F 7/02 8202-2D E04G 23/02 A 7228-2E

Claims (22)

[Claims] 1. A coarse substrate including a coarse woven base fabric composed of yarns including at least warp yarns and weft yarns which are arranged in parallel with each other with a gap between the yarns, and at least one of the coarse substrate substrates. A flexible polymer film layer affixed to the surface, the polymer forming the film being regenerated cellulose, cellulose esters, polyvinyl chloride, polyester, polyamide, polyurethane, polypropylene, polyethylene, ethylene. -A ventilation tape repair tape, which is selected from a vinyl acetate copolymer, an acrylic resin, and polyvinylidene chloride. 2. The repair tape according to claim 1, wherein the rough substrate is made of the rough woven base fabric. 3. The repair tape according to claim 1, wherein the rough substrate is composed of the rough woven base fabric and a thermoplastic polymer layer covering the yarns constituting the rough woven base fabric. 4. The repair tape according to claim 1, wherein the film has a large number of ventilation holes. 5. The repair tape according to claim 1, wherein the film is attached only on one surface of the rough substrate. 6. The repair tape of claim 1, wherein the film is transparent. 7. The repair tape according to claim 1, wherein the film is colored. 8. The repair tape according to claim 1, wherein the film has a thickness of 0.05 to 1 mm. 9. The through holes of the film are 0.25 to 225.
The repair tape according to claim 4, which has an area of mm ² and the total area of the through holes is in the range of 10 to 90% with respect to the total area of the film. 10. The repair tape according to claim 1, wherein the film is adhered to the rough substrate with an adhesive. 11. The repair tape according to claim 1, wherein the film is heat-sealed to the rough substrate. 12. The yarn constituting the coarse base,
It is covered by a layer of a thermoplastic polymer having a melting point of at least 5 ° C. lower than the melting point or the thermal decomposition temperature of the yarns of the coarse woven base fabric, and at the intersections of them are bound to each other by the polymer coating layer. The repair tape according to claim 3, which is a worn composite yarn. 13. The repair tape according to claim 3, wherein the polymer coating layer is a porous layer made of a foamed polymer. 14. The repair tape according to claim 1, wherein the yarn in the coarse substrate has a flat cross-sectional shape parallel to the plane of the coarse substrate. 15. The flat cross-sectional shape of the yarn,
Length (l ₁ ) in the direction parallel to the rough substrate plane
The repair tape according to claim 14, wherein the ratio of the length to the length (l ₂ ) in the direction perpendicular to the rough substrate plane is 1.3: 1 to 7: 1. 16. The repair tape according to claim 15, wherein the ratio l ₁ : l ₂ is 2: 1 or more. 17. The repair tape according to claim 1, wherein the warp and the weft are made of polyester fiber, polyamide fiber and / or vinylon fiber. 18. The polymer coating layer is polyvinyl chloride,
The repair tape according to claim 3, 12 or 13, which is formed of polyurethane or an ethylene-vinyl acetate copolymer. 19. The repair tape according to claim 1, wherein the coarse woven base fabric is a plain weave, a warp weave, or a entangled woven fabric. 20. The inter-yarn gap distance of each of the warp yarn and the weft yarn in the coarse substrate is 0.5 to 15 mm.
Or the repair tape according to item 3. 21. The repair tape according to claim 3, 12 or 13, wherein the film is adhered to the rough substrate by the polymer coating layer. 22. The repair tape according to claim 1, which is wound in a roll.